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[Merged by Bors] - fix(algebra/algebra/operations): add missing set_semiring.down casts#18539
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[Merged by Bors] - fix(algebra/algebra/operations): add missing set_semiring.down casts#18539eric-wieser wants to merge 3 commits intomasterfrom
set_semiring.down casts#18539eric-wieser wants to merge 3 commits intomasterfrom
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The diff being ported is leanprover-community/mathlib3port@d034837#diff-968496f13ddf1f2e9b559f374e46c52125a2ada4f449bbce0989bc8ef4965e67. This also includes a fix from leanprover-community/mathlib3#18539
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#18539) Previously this was abusing the defeq of the types, resulting in lemmas stated in weird ways. This also fixes a type in #18449, and adds three missing lemmas about `image_hom`. Forward port of `set_semiring` will be included in leanprover-community/mathlib4#2518
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set_semiring.down castsset_semiring.down casts
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The diff being ported is leanprover-community/mathlib3port@d034837#diff-968496f13ddf1f2e9b559f374e46c52125a2ada4f449bbce0989bc8ef4965e67. This also includes a fix from leanprover-community/mathlib3#18539
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This records leanprover-community/mathlib3#18539 as already forward-ported; the actual typo fix was included in #2518.
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Previously this was abusing the defeq of the types, resulting in lemmas stated in weird ways.
This also fixes a type in #18449, and adds three missing lemmas about
image_hom.Forward port of
set_semiringwill be included in leanprover-community/mathlib4#2518